when do silkworms hatch

https://silkwormrearingkitshop.juniperbrief.com/posts/getting-started-with-a-silkworm-rearing-kit-a-practical-guide

Silkworms hatch in spring when the temperature stays consistently around 75 to 80 degrees Fahrenheit, typically 10 to 14 days after eggs are laid. The tiny black larvae emerge from pinhead-sized eggs, and they need fresh mulberry leaves to eat immediately. Timing is crucial because if the leaves are too old or dry, the caterpillars might not survive. That's why sericulturists carefully plan hatching to align with mulberry tree growth.